Educational level was also significantly associated with age of onset (χ 2 = 17.194, df = 2, p < 0.001), although differences across detailed age-of-onset categories did not reach statistical significance (χ 2 = 10.997, df = 6, p = 0.088).
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When Stones Begin: Age of Onset Reveals the Systemic Metabolic Nature of Nephrolithiasis.
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